METHOD FOR RETROFITTING SECURING MEANS FOR SECURING MOUNTING INSERTS EMBEDDED IN A ROOT OF WIND TURBINE BLADE

Method for retrofitting securing means for securing mounting inserts (14) embedded in a root (5) of a wind turbine blade (4), which mounting inserts (14) each comprise at least one stud (16) extending axially from the root (5), wherein the blade (4) being installed at a hub (2) of a wind turbine (1), characterized by the steps:- drilling at least one hole (19, 20, 21, 24, 25, 26) perpendicular to the mounting insert (14) from at least one root surface (7, 23), until the hole (19, 20, 21, 24, 25, 26) extends into or through the mounting insert (14)- threading the hole (19, 20, 21, 24, 25, 26) at least in the region where the hole extends into or through the mounting insert to adapt it for receiving a threaded bolt (38)- arranging a reinforcement plate (27) at the root surface (7, 23), which reinforcement plate comprises at least one opening (28, 29, 30) which corresponds with the hole (19, 20, 21, 24, 25, 26)- arranging the threaded bolt (38) through the opening (28, 29, 30) and screwing the bolt (38) into the threaded hole (19, 20, 21, 24, 25, 26) for fixating insert (14) to the plate (27).